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|-|Core=[[File:Pyrus_Cyndeous_(openOpen).png|250px]]|-|Ultra=[[File:Pyrus Cyndeous Ultra (openOpen).png|250px]]

{{Nihongo|'''Cyndeous'''|シンディウス|Shindiusu}} is a knight-like [[Bakugan]] that appears in ''[[Bakugan Battle Planet]]''. He was originally owned by [[Marco Chezanello]], but Marco's actions as a mean and bully Brawler causes Cyndeous to leave his partner and become [[Dan Kouzo (Generation 2)|Dan Kouzo]]'s second partner Bakugan.

A [[Haos]] variant of Cyndeous appeared in both seasons of ''[[Bakugan: Geogan Rising|Geogan Rising]]'' and ''[[Bakugan: Evolutions|Evolutions]]'': one temporarily wielded by [[Jenny Hackett]] , and a set of ten by the [[Gate Crushers]] leader [[Wagner]]. In addition, a Haos Cyndeous is a component of both forms of the Fusion Bakugan [[Cyndeous x Skorporos]].

Cyndeous writes his own rules. He is stoic and fierce. He's not afraid to challenge his partner when he believes in a different strategy or it goes against his values. He likes to play pranks and provoke, and believe he’s he's the best looking Bakugan of all time! Aligning with Dan and company slowly helps Cyndeous realize that he can trust his instincts and be masterful warrior he believes himself to be.

Pyrus Cyndeous is originally under the control of [[Marco Chezanello]], and although he shows signs of disagreeing with Marco's actions. Marco uses Cyndeous to bully the [[Rowdy Reds]] out of their park at [[Costero Canyada]]. Cyndeous follows Marco's orders, despite their cruelty, due to his lack of knowledge about Earth being exploited by Marco. As Dan is initially rolling [[Dragonoid (RebootGeneration 2)|Drago]] onto the [[Hide Matrix]], Marco orders Cyndeous to knock Drago away, sending him flying into the trees. After Marco traps [[Trox (Generation 2)|Trox]] and [[Gorthion]] into a hidden pit, Cyndeous shows more signs of disagreement with Marco, wishing to fit honorably and not attack two defenseless Bakugan. However, he proceeds with his attack after Marco demands it. Marco then orders Cyndeous to attack the brawlers themselves, which Cyndeous objects to. Marcos cruel demands cause Cyndeous to fly in a fit of rage, and summon fire balls to ravage the ground. Cyndeous also sends an attack towards Marco, but it is blocked by Drago. Cyndeous wails on Drago, but is knocked off by Trox and Gorthion. As Drago counterattacks, Cyndeous snaps out of his rage, and directly tells Marco that he will no longer obey his cowardly commands. Seeing Cyndeous' desire to no longer brawl, Dan calls the brawl off. Later that day, Cyndeous ends his partnership with Marco. Seeing Dan's honorable actions during brawl, he asks if he could become one of Dan's Bakugan, which Dan accepts.<ref>''[[Bully for You]]''</ref>

In ''[[Teamwork Makes the Dream Work]]'', Cyndeous, [[Dragonoid (RebootGeneration 2)|Drago]], and [[Gorthion]] are hiding in the [[Studio D]], keeping an eye on [[Nillious (Generation 2)|Nillious]] as he attempts to taunt Drago into a brawl. After a failed attempt by Gorthion, Cyndeous steps in and uses [[Volcanic Lance]] against Nillious, but misses and is taken out by [[Shadow Breath]].<ref>''[[Teamwork Makes the Dream Work]]''</ref>

|Evolved from [[Pyrus Cyndeous (Bakugan Resurgence)|Pyrus Cyndeous]]

|Evolved from [[Pyrus Cyndeous (Bakugan Resurgence)|Pyrus Cyndeous]]

|Evolved from [[Aquos Cyndeous (Age of Aurelus)|Aquos Cyndeous]]

|Evolved from [[Ventus Cyndeous (Bakugan Resurgence)|Ventus Cyndeous]]

|Evolved from [[Darkus Cyndeous (Bakugan Resurgence)|Darkus Cyndeous]]

|Evolved from [[Pyrus Cyndeous Ultra (Battle Brawlers)|Pyrus Cyndeous Ultra]]

|Evolved from [[Aquos Cyndeous Ultra (Battle Brawlers)|Aquos Cyndeous Ultra]]

|Evolved from [[Darkus Cyndeous Ultra (Battle Brawlers)|Darkus Cyndeous Ultra]]